SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d6f2d64129161f495edbf15078093adf5b6c190cb91f36bef00c0133a9070d' 
  AND token = 'qxmPx7rlR60jMIhmNX/4aJ/NGBYpOcviV/+gfo7+rOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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