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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8220776500ce14acca49a2cf3ce34e7c75ecd3566d118dc4943543819d15f6aa' 
  AND token = '8gfUKDlX4pUSRj3rfSBlcMTEJ7LeqWkxKkEyc6d+I4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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