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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bea4d1eeb2c08966f1db6517de579763de912e77dbea577bb8caaeb20d21242' 
  AND token = 'NHK0uvq0S9hCHI13XSrSShSXTmM4rmkY6EEjH1SVG28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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