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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9562af429a2d252c38cec166c5e2b83c0c1f1233c477c207c7785fcf598bdc13' 
  AND token = 'Kv82W3NXnrxFreJMfHUm/fOPcU7eJMtSVf3Mok9l1kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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