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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b0be6039f0a5a36ec831aab977d7df99360db7302dc07dcc3beba356a3ec42' 
  AND token = 'kl4nKpiL2ppnKhotKU/2VqA8ABePfOLEMK184lKreas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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