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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3725c39b8b82bdc5ac191ce6f69c90fafb6067be515b308128fab2d607ba23' 
  AND token = 'Ti8t1CxUdeMjnIM9zVhP2tb8B9UovK/6ZyAu8PQfH20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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