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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd503301a1f45f863979f8a67b06f35604456f78e87e059787d34e63defb89318' 
  AND token = 'QILxrvwJzQzktVc6Luvn+HinM3RKu6PQJflsVOdPtWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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