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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35d033b315f6ebd25cdc2c9e4cfc8b84e8d722c1663dda8110e8147ebcc7ba0' 
  AND token = 'hkLWXhyO8ZvXhpmB/Vjhkm2DWldt6T1CcxTHhBJC9tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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