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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1028fac9b040d416ca1658fbf319fc61324d3b3aa3e81ea85d904de8eb735173' 
  AND token = 'mmBFnmmOc44MlUKJMmT204mo+3mfMiF5HD5aDqtmQbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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