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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0bab2e9ede38972775ceeef06dc84d7c7ca6f00758f4dd35587d879e6d80a3' 
  AND token = 'DwPWbg9b9AE66cYO7sitip7S7jFlWcZlQ78DXac3mMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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