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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dde68fa82342fbc4fd24fae19d13f4626c649f08b811b6490b8f61c1111a47' 
  AND token = '1YILPdO1FzkWo4PGjT+XEj+8If3OA31khsbIrrKC3JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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