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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bb7a780ec3960784c0a47b51cd1a9bffef6c6c7a46c4d259b12df9396572e1' 
  AND token = 'aU9Tvn9QjBn2MW9kxBplIW3H6lRufLfOrncI0ZnWkG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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