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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631c9a186ff375266aadd261f420daffd6b05f7940eaf726952d0c534824f914' 
  AND token = 'TioseToOoivoe5iTjmp2zZxCWl5zk+2LFU5VzoRN0v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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