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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfb4166ac9624648e137df286a4b7d808138de4024463a89fce6520c9369e05' 
  AND token = 'WJcW9R7+5BV3hyl7GyklYZl3hvTen3mqTO5ONq/E3Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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