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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6150cfc7367af2318d72198ff955e30f5b089225a1f530898500b5a436360d' 
  AND token = '1af+tYQhtkEmyarePunuY0H0VzFXZGikTgPbka/+8/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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