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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f317617f326a7d6f13a3f97e962012b191862fbda529472834d55ba26751c9d' 
  AND token = 'KTxwWcX6r5/Q7MlqArrUXoWHmCrY4Jsj01oQIdx0DuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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