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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739a25ebd7dab99faf0fa5c60d05cd97c9d8b82c443f3c2eaa901c10abee42cb' 
  AND token = '92Vf/Pxi5OFEQ7J2ksXekIsSShVA5u85eJ2DAtklr/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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