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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8884e45388ebe60726f20e94b0daa6795ca83c7e1b04f4bc7d1d758bcd73ebb' 
  AND token = 'c1QgLrmTuIcQo+rJzTCWQG55m2K59tTJT/RSSdMzt/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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