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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f53c9c2a0f577a64804b53347ce2aa04474138a290ad1f03671dc8aa784188' 
  AND token = 'Cwrxc9h7tQHyEbraPz6GVRUcHUKhuDfIU7N8tD4M+hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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