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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b173dbb7ba1c92c5a1d5b35063bf760a9781e0938e6ebab52a8a4b1319e07eb' 
  AND token = '55wanQUohpqdP3zXCJLVe1gKAp8AZZSDu9sxCmy4BbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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