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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccfaa974f434c5eac118e04fed749974c12e5409bcba22eeabf3051af7fab22' 
  AND token = 'CysvsRzmVy26BdNj3jROouAi2Mpd0lZG5cOQdd3xo2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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