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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b312f8d6d63b18111c86ddc2fa7f79adef42008ea092c49d27f4b8c106dbe0' 
  AND token = 'pHh6L8PxxqJv9Q+Ss7rDP0Qp7VzqGDpbBXNA1JDz/EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}