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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2927b4ca03e52ad8b34a6367d966b6ae439158a642ef047087a056ea50679334' 
  AND token = 'O4TwqPfOfRicNn32ltyOQe6/YV4ZMBw/N/03n0EKTWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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