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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b487e022ec6c70c930973ce06969290c870ddea9483ba19b19a9a2ee1a827c' 
  AND token = 'MJ4BoGB/uvj+J6aRZPI96xF3H9iVhSAGH8QDpMK4V3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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