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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a8741f59c6a37d556200f9deb1b81fdda6e5ba1a8e548d66a1fdc6e79db094' 
  AND token = 'jaXXxj0mIFY5mGeTSGVt0jWPxp4kIH6K9fbjuRjXrWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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