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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3569dd8b60f3ce0012c62dc53e9962255725105e55e766e6331fb3b0a991bf08' 
  AND token = '3EyCihB4l67YaU/wXW8cM9ZrfEdD6Fn+nXwOsror+ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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