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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfda95723b8df628525ed4e07a61c56eb1d9392baeb2e69a5c05c71162b01bb' 
  AND token = 'H2zQHpjwv9BxT9FQKYttUnOLHnI2bpredr8xWcyzl8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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