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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02575c9c986b3b534f3eeb398bec34b6e466a04c523857953fe58b6347239afd' 
  AND token = 'Byced+PuN8jBQko8i55Tn/cgIYjSu/5jYPJZGV/yTa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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