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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6e7c82201accfdca5a3b1ab582ac8dad7f4f592d0e13889ba35cb444512df5' 
  AND token = '3XEmZ1uGQ30MqvhMq0jGscOhqqTxI2b515rZtqorKvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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