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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fbcd8f2a37192aa54936d861834eaf11bd725d21c3088098a74ae83e00bac9' 
  AND token = 'xu4NEa81pOepXCDlKDLLknypaNtjVZ8+krPstX6ycYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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