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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36170072f94e748d67c277a9e8421e32c0e4ec6249d15d9dabef835ddfe56de' 
  AND token = '5JA1yzp0RW/g7ZI6zHouRUbfCWkgis92voYqpI9Esjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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