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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69818133d43f05a246712ea9ef7a94d8c5ea1d4f44ed3532abb862ad4d36c6c8' 
  AND token = '9xzFdfNNRM6HzSHGGCF+pyiwrPuKyrG1Af/lG9Yoiss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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