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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4adc7313b63be99169336db8c466d24799e880f9aed0f7ee5a3277366e9f72' 
  AND token = 'WaWMdcMsyMQjqQeQ6jNUCG1BaAvy3tyfb3R4OPWcaxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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