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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1833b9fec1f32e5a68b82eed770edb1a6d72e4ffb551ce749d28b19914acfd' 
  AND token = 'ojs2a78ERfCaGD0/v5FoyubA/LIfIXWh7a2D37Xim68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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