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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b393aa4143e1a7e5d951cc3fe3c484625dcd1103d52d41df57c36b58f11138ac' 
  AND token = 'XBa4Uxu04Ixuenf3RmPcOkLJaxvW8PGnf4e+GNcZcO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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