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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ed6acedf6ddf798442af1cd7d6003803d4969538263cce661dba97be7e82ed' 
  AND token = 'v2nsU0U05G6E7wq8zei/5cxY/VkYBod1x1Hob84ulkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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