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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe689b4282d451844f4fcb8d2e3b98db4c519e26deabbbea6a1c260a802bd41' 
  AND token = 'D7vNYoXkLxR81KB295RKrBqZg49rTr3iMWyRTz0RKpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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