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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d1a09d7735c132bb9540c52c19d989369a58bf698bbd589dee33e78c8e65f2' 
  AND token = 'bAinoTEExg0kjb6xjtaI3QEhNaihLLmGsT/q+TSrLHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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