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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f146f8f2b45a8bae4ae4e6861f77ce717415a0ab2a5ddb1e36ee1f5d02e66d80' 
  AND token = 'qmwafZQV8/TSFs15sTjTdVYUBRzcaFXb1TmJS+HztYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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