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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33721c53b21601c90d5a5ba314623c9bcbdb4cc4562b9c7ab7baa0bac59dae0' 
  AND token = 'KEVExgCeCCJSr/ezKM9Vz9yXedI+Rq9cUr34FgNT4Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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