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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cee363f746766251752203e97036d1168601e8f10269c26cd1f3fef96d03cd4' 
  AND token = 'kkVupChn8UG8kpUp1ZO+l6HmcYKeXjBgL4tv5liDFbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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