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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6cf221cbebf9d1d66433ac39e19e15954d99b179d445e2c93565870ad48b34' 
  AND token = 'rJau06PpCgmEzoF9mFhq8aRnfPikdfRUwvVHu+ifRzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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