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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d67c437e527f772d11f7ef81c966ac9fff4451a9fe48d1fc7e97ea455822bf' 
  AND token = 'MLto/N93K6DsNagLmlDQ01/XzJIB0xriQXrwPlLhsKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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