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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7eee23c89af7744c77429559a8351e9b7ead5b1e711b12f27cc03332b5f73f' 
  AND token = 'jz1m4SmZO8beu2mlghiexc4BZ0Q25ocM/ZidBAL8mHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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