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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b05d19f4f09c87ced8dff7e98a3154e33bdcef38d3ec26457bb76c685e0429' 
  AND token = 'TFCbCsTHSZ176vMurVnnG70p9MieVggALOGLVfgGMko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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