SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53d14e70d67e738c7c349780dca552a7adaae9817d748ff17ed0b6345521dbb' 
  AND token = 'BgVyeDwwTpIZRWYYzIh/xRLrqAFVqfUkssMjOmZFXCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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