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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee0c6fa0f5b53493efd74d9c1e56aa967c52bfe537ceef95a958b5baf2694c7' 
  AND token = 'NExGsNOyM5F/1Zi3eEd4EUQW6NOSFl2GmWCggzycneM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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