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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae3f9fe77ce37e615192f41db77301ce20a4a5e80b4f21177ac155a029933a4' 
  AND token = 'h43gVJJmJ1NKNduFcyr1qvxH1w+XxZ71GZbF94vcLn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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