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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0dece350afe00cc4ea75b0e1138e320a158ebbe494c5fe39dc7a0eb50672ec' 
  AND token = '2JsqbRyxglINyhFVok6VgOYgOzN/yiIXRa7cGBf2f2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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