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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea36a975d9f9ca5835a78e3ce895aeda1bfef5c0ad97756f352a295c6734aba' 
  AND token = 'b///PCT9cgsqhNC2l9JHGUZ0kt8fKyMs8wuQYo1Xb3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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