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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02f076ddc81e863cbd2523a3de7560d47368a64334927ae4d9918c6d265ce63' 
  AND token = 'KZTCQvJM7dwdpfHlTMH0JTpU86iCC4Qi3bGmdj5hxXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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