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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbba9dd87d9976cd79858affb72ad7e6864ee9170e5a1e9803302a9ddcf48722' 
  AND token = 'b2zDxf1fLOW0EPdcGaKXzw75Tv/eLm+aqp2c+CQWmr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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