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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0cb0ca091b65759cd7c61cb71de3a41184038e6607418393353812510ec08a' 
  AND token = 'Ns8NtwO4CSoswkMx3FvLuO7PUWvxNcOsfE6afHgGDhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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