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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1552a7c3cfc03f8f8ef9506a59fbf482bbb07cc98b46aeb287a8ffc14aa1ea67' 
  AND token = 'fiRaEX5ISHSXllz0Vgzmi8d+Wn/yQH+CTTR2nLVu4mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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