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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd8a9ee5f85ba147ece378942cbcb306aa27beabc47958048520371e59cdcdd' 
  AND token = '1mOJryI6r3xhGdYkglCGCh2mBcUv2c9xDxHLwTBmDlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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