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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8d198014bca407ca8383d003892f3c3495b0c4f08bf23a84c018a087bb0b8c' 
  AND token = 'epchzIxhUnrPG2ft15dov+8qQRFGg87i0Z6VO6OMzR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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