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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb3949ce84bf1b3e5ddf6284d874ba17d330a774a0d852e27651129c824c1cf' 
  AND token = '5AO/2jmP05mgk0BqsSZNf2+FNsrim+Dmop5wE4lXn0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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