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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88cd847ed334d2498b9f1f77aa41a42d1cfab2b53a6de6254581c70523011d6d' 
  AND token = 'o/khaX5071mOYR9DN2LaAkEY2JC6nLCqI94Qj9KYO9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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