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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b8039f2518b51f8100628dda6f023e28623c37e1f318f5ac29c58688472af4' 
  AND token = 'jdNRM9w7RTeNmHI4tsGW22KiqsmrMucSlS3pIgrjNyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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