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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f9626f292ebe041f230a26a629869c4dc040f4ad16e6bd34ac8e4e18641fce' 
  AND token = 'jS9XVCwcQ350JgZl/tmnR3ceMzwk8ztC4knOeHmeLJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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