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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690845868b2f0ef5b9f2464ff223305dc500144ae7e19b3dfe08b4c579a8b4f0' 
  AND token = 'iE1wxhPkHGyDlGc997abxDow89GA4Jna5Xum1wZReLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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