SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8c5e8c8cf7c19a8fe276fea767ae0d59674de81cf60fb11d357f550c1db4be' 
  AND token = 'NBIsOsRE9D1uGKCXyHKSVMoSFz9F2VBb/ThsPvfc1qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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