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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef1913f385db57a9764918961c0ff0f23082bc4b0576734b090b20d668487f3' 
  AND token = 'xfbck2q92a/Ls6Y39RBoDUMlx5VP+KakfVL5eHUI6uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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