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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e94eb7cfacf410e8a8f9d1372732fcfe8a32c05ff6b6ff8a3f928dad328d22f' 
  AND token = '6fh4fthzKN70vAsMrpr6VuO7A1NKXjF+wamteVumHlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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