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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa312461c857e7b5506cda7bfcd055bcd443eccc80861b00eb204aa33ec08e96' 
  AND token = '9G31NJGVrMQEB46+kh3dnrxzrZt8x+hnu0sHx/h31I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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