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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fdba337765d57807fb3424b3f2d4b9e06020d32d469828bd30e36d64941cda1' 
  AND token = 'cJSukpyeAPzkEswgjuGr3g607YV7CeXh1F592yLg6PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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