SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6df9fff4047356dd0043a8d7fc10f587668675ee187299c83a72439fb26f2b' 
  AND token = 'L/rTS30AulppZsvUjRjp+hv8at559NqTBWZA1LhJE2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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