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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04684ee5c6b091e718ea7de6400a1b02a58699c36a8e0088b53c23f88583687' 
  AND token = 'sfqJDg5z6M/hLiLc06ucffg6QfQUIVLHogNY7kFCTGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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