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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326666a6c0a100fd232f7edf04c71e6b8ddb699e8194f3619be11e2e63de8dbc' 
  AND token = 'wphF9J8YXVpW4EYAKmbB2onnCvhUQp4nosg+ruPoWz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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