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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c5d1bc9c27e0c41fd5516c74de0c7ca478066994cdac9d4ea518365b35f2ec' 
  AND token = 'jZWgf5SXMy9vBqBWqiP7fWnphay/jzXkueX7w/zI2T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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