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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51513af84c2f1e3746d23dfe3c8c89a26735bfa8a5392ca92b1fdf8e314a6ad9' 
  AND token = '9nQZMGIo9CvK0Iz9dzaOziCtATCvS9np+m0ZuSgF604=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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