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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228c352a676c45aff179cb50df70cdc0d70b2c6c1b0191dcb2b6f56478485be8' 
  AND token = 'w8bL/dMdvJm/dy69qiv1wGQ6b+iXorfONbl3C6V+xrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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