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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35d37311fcc0c21e5b909aa47ff82cc4e179dbf5189355d8d8c23ae95fbbd1f' 
  AND token = 'ZpD5JaLDhdV2qlp/qzKQso4vku3DzNXiC/h/5hThmx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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