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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b64ce7470e8b29db905339713b7bc2ebeab72beaaf67739d47e97d4740536a' 
  AND token = 'vHB+XQDOCtBB2kC6YNQXDbqrTlExO+PBrQDgGznCd6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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