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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1755909209618c6ae91d9371c1641dd15ad155e5da5bd85725672f113d8ce50f' 
  AND token = 'fk7d5+N2DzlvFOB4NlswQa2z/yTsPu+uiAtV0rG4J5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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