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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf158965191dc795321c0d1be770798f77633798af37079bf794260f18299f92' 
  AND token = 'SWCzuqLAvzNgyJYI3e17W5bFN3p730TwMPisFC6gneo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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